JavaScript案例：倒计时

展示效果：
代码示例：
<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>倒计时</title>

    <style>

        a{

            /*去除下划线*/

            text-decoration: none;

            color: black;

            font-size: 20px;

        }

        span{

            color: skyblue;

            font-size: 25px;

        }

    </style>

</head>

<body>

    <div>

        <a href="#">现在是北京时间：</a>

        <span>2022</span>

        <a href="#">年</a>

        <span>5</span>

        <a href="#">月</a>

        <span>5</span>

        <a href="#">日</a>

        <span>19</span>

        <a href="#">:</a>

        <span>50</span>

        <a href="#">:</a>

        <span>54</span>

    </div>

    <div>

        <a href="#">敌军还有</a>

        <span>5</span>

        <a href="#">秒到达战场······</a>

    </div>

    <script>

        var box = document.getElementsByTagName("div");

        var spa = document.getElementsByTagName("span");

        // 日期

        setInterval(function () {

            var data = new Date();

            // 获取年

            var year = data.getFullYear();

            // 获取月

            var mouth = data.getMonth()+1;

            // 获取日

            var day = data.getDate();

            // 获取时

            var hour = data.getHours();

            // 获取分

            var mini = data.getMinutes();

            // 获取秒

            var sec = data.getSeconds();

            // 补齐两位数

            if (mini<10){

                mini = "0" + mini;

            }

            if (sec<10){

                sec = "0" + sec;

            }

            // 获取到的年赋值给第一个span标签

            spa[0].innerText = year;

            spa[1].innerText = mouth;

            spa[2].innerText = day;

            spa[3].innerText = hour;

            spa[4].innerText = mini;

            spa[5].innerText = sec;

        },1000)

        var timer = 6;

        setInterval(function () {

            if (timer<=0){

                box[1].innerText = "时间已到，全军出击！！！";

                box[1].style.color = "red";

                box[1].style.fontSize = "20px";

            }else {

                timer--;

                spa[6].innerText = timer;

            }

        },1000)

    </script>

</body>

</html>
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JavaScript案例：倒计时

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